大保高速公路四角田隧道
來源:www.chinagufeng.com  作者:墨幽  時間:2009-04-29  點擊量:   
【字體:

    大保高速公路四角田隧道   

四角田隧道為大保高速公路上一座上、下行分離 ,雙向四車道長大公路隧道。隧道位于云南省永平縣西南部普棚鄉四角田村附近,地處構造侵蝕深切割高中山峽谷地形,谷深坡陡,隧道進出口為山地谷坡,穿越山脊,山脊頂部渾圓平緩,地表水豐富。隧道最大埋深242.77m ,隧道進出口端埋深較淺。
   隧道巖體完整性很差,巖層擠壓揉皺強裂,結構松散,圍巖整體強度很低,巖層含泥量高,富含蒙脫石等親水礦物及云母等狀軟弱礦物,導致圍巖具有一定的膨脹性,遇水極易軟化、泥化,圍巖變形量較大。地質條件為大保高速公路上最差的一座。
在施工過程中,上行線進口K444+644右側拱腰處出現較大規模的突發性涌水泥石流,堵塞隧道長度達100多m,采用了全斷面設置混凝土止漿墻,打管進行深孔注漿回填,固結坍體,大管棚超前支護,短臺階法開挖,支護加強等有效施工措施,順利地通過坍方段。

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